fsockopen 函数来查询一个端口是否开放。，，``php，$host = 'example.com';，$port = 80;，$timeout = 5;，，$connection = @fsockopen($host, $port, $errno, $errstr, $timeout);，，if ($connection) {， echo "Port $port is open on $host.";， fclose($connection);，} else {， echo "Port $port is closed on $host. Error: $errstr ($errno)";，}，``，，这段代码尝试连接到指定的主机和端口，如果连接成功则表示端口是开放的，否则端口是关闭的。Powered By Z-BlogPHP 1.7.3
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